Jamie Blackley and Toby Regbo now lead the cast of the UK thriller, based on a real-life story.

Shooting started last week in the UK for new thriller uwantme2killhim?, which is being sold by Independent.

Andrew Douglas directs from Mike Walden’s script, based on a Vanity Fair article about the true story of teenagers who met online with violent results.

Because there was a delay in production, the film has now been recast, with Jamie Blackley (Snow White & The Huntsman), Toby Regbo (One Day) and Joanne Froggatt (TV’s Downton Abbey). The cast also features Liz White, Jaime Winstone and Mark Womack. [When a July shoot was announced in Cannes, the cast had included Jack O’Connell and Olly Alexander.]

Shooting will take place mostly on location in Harlow, Essex and Hemel Hempstead, Hertfordshire, also with a week of shooting at Elstree Studios.

As previously reported, Momentum has UK rights and sister company Alliance Films has Canadian rights. The Weinstein Company has acquired several major territories.

Prescience’s Aegis Film Fund is financing.

Bryan Singer had optioned the article in 2005 to direct himself, but he will now serve as a producer.

The film is an Anonymous Content/Bad Hat Harry/Andrew Douglas Films co-production, produced by Singer, Anonymous’ Steve Golin, Peter Heslop and Simon Crocker.

Douglas previously directed Searching for The Wrong-Eyed Jesus and The Amityville Horror.

Independent’s slate includes Tilda Swinton-starring We Need To Talk About Kevin, Joanna Hogg’s Archipelago, Marc Evans’ Hunky Dory, and Noel Clarke-starring Storage 24.